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x86/hyperv: Add an interface to do nested hypercalls

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According to TLFS, in order to communicate to L0 hypervisor there needs
to be an additional bit set in the control register. This communication
is required to perform privileged instructions which can only be
performed by L0 hypervisor. An example of that could be setting up the
VMBus infrastructure.

Signed-off-by: Jinank Jain <jinankjain@linux.microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/24f9d46d5259a688113e6e5e69e21002647f4949.1672639707.git.jinankjain@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Jinank Jain 2023-01-02 07:12:53 +00:00 committed by Wei Liu
parent 7fec185a56
commit f0d2f5c2c0
3 changed files with 43 additions and 7 deletions
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3
arch/x86/include/asm/hyperv-tlfs.h
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@ -382,7 +382,8 @@ struct hv_nested_enlightenments_control {
__u32 reserved:31;
} features;
struct {
__u32 reserved;
__u32 inter_partition_comm:1;
__u32 reserved:31;
} hypercallControls;
} __packed;

46
arch/x86/include/asm/mshyperv.h
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@ -72,10 +72,16 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
return hv_status;
}
/* Fast hypercall with 8 bytes of input and no output */
static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
/* Hypercall to the L0 hypervisor */
static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output)
{
u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output);
}
/* Fast hypercall with 8 bytes of input and no output */
static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
{
u64 hv_status;
#ifdef CONFIG_X86_64
{
@ -103,10 +109,24 @@ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
return hv_status;
}
/* Fast hypercall with 16 bytes of input */
static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
{
u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
return _hv_do_fast_hypercall8(control, input1);
}
static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1)
{
u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
return _hv_do_fast_hypercall8(control, input1);
}
/* Fast hypercall with 16 bytes of input */
static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
{
u64 hv_status;
#ifdef CONFIG_X86_64
{
@ -137,6 +157,20 @@ static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
return hv_status;
}
static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
{
u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
return _hv_do_fast_hypercall16(control, input1, input2);
}
static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2)
{
u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
return _hv_do_fast_hypercall16(control, input1, input2);
}
extern struct hv_vp_assist_page **hv_vp_assist_page;
static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)

1
include/asm-generic/hyperv-tlfs.h
View File

@ -194,6 +194,7 @@ enum HV_GENERIC_SET_FORMAT {
#define HV_HYPERCALL_VARHEAD_OFFSET 17
#define HV_HYPERCALL_VARHEAD_MASK GENMASK_ULL(26, 17)
#define HV_HYPERCALL_RSVD0_MASK GENMASK_ULL(31, 27)
#define HV_HYPERCALL_NESTED BIT_ULL(31)
#define HV_HYPERCALL_REP_COMP_OFFSET 32
#define HV_HYPERCALL_REP_COMP_1 BIT_ULL(32)
#define HV_HYPERCALL_REP_COMP_MASK GENMASK_ULL(43, 32)